In brief: EcoMotors International is a startup working on commercializing an opposed-piston, opposed-cylinder (OPOC) engine for medium and heavy applications. They showcased their EM100 module at the ARPA-E Summit and are claiming a 45% greater fuel efficiency for the concept.

The word

An OPOC engine runs on the simple principle of opposing cylinders rather than side-by-side conventional engine layout. Each module for an engine comprises two cylinders, faced in opposition, operating on a 2-cycle principle with each crank revolution providing one power stroke. As one cylinder fires, the other is compressed and then the process reverses.

The OPOC engine concept is simpler, more efficient, and eliminates the cylinder head and valve train components of a conventional engine. The EcoMotors OPOC is capable of running on most any liquid fuel.

The EM100 (EcoMotors 100mm cylinder bore) module would be one section of an engine which could produce up to 480hp for any vehicle up to a Class 8 truck. It would deliver 45% better fuel efficiency and emissions at the US Tier 2 Bin 5 level, bringing heavy-duty commercial trucks down to the emissions levels of light-duty diesels.

And so ...

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